Rotary flue-cleaning cutter.



No.'7l|,043. Patented Oct l4, I902.

' c. a. EASTY.

.ROTABY FLUE CLEANING CUTTER.

(Application filed Sept. 26, 1899.)

(lo Model.)

WITNESSES: w

'w zgc'i M4.

A TTOHNE Y'S m: Nomus vzrzns conuarouma. wwmumu, n cy UNITED STATESPATENT OFFICE.

CHARLES B.

EASTY, OF GLENVILLE, OHIO.

ROTARY FLU E-CLEAN ING CUTTER.

SPECIFICATION fOrming' part of Letters Patent No. 71 1,043, datedOctober 14, 1902.

Application filed September 26. 1899. Serial No. 731,782. (No model.)

To all mil/mu [It nm y .071007%:

Be it known that I, CHARLES E. EASTY, a resident of Glenvillc, county ofCuyahoga, and State of Ohio, have invented certain new and usefulImprovements in Rotary Flue- Oleaning Cutters; and I do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itpertains to make and use the same.

My invention relates to improvements in rotary iiue'cleaning cutters;and it consists more especiallyin an improved construction offlue-scraping blade or cutter that is rotal ed within and fed throughthe tube that requires cleaning in any approved manner.

The object of this invention is to provide a stiff cutter that has twocutting edges converging toward the forward extremity of the cutter andone of the said edges being scalloped to render it capable of cuttinggrooves or channels and the other cutting edge being adapted to cut awaythe scale or deposit be tween the grooves or channels made by thescalloped edge of the cutter, and hence the work that the cutter isrequired to perform is distributed uniformly between the two edges ofthe cutter, so that .the wear upon the cutting edges is equal orapproximately equal.

It is well known that rotary flue-cleaners, wherein my improved cutterwould be suitable, are operated by fluid under pressure.

The motor and the connection between the blade and the motor form nopart of the present invention, and detailed illustration thereof is notconsidered necessary in this application.

In the accompanying drawings, Figures I and II are opposite side views,respectively, of a fine-cleaning cutter embodying my invention. Fig. IIIis a forward end elevation of the cutter. Fig. I shows a portion of amotor-shaft and the connection between the cutter-and the said shaft.

Hyimproved flue-cleaning cutter comprises a blade at, that is providedat its rear end and centrally with a shank b, that is pivoted, as at c,to and transversely of the one end of a link d, that has its oppositeend pivoted, as at e, at right angles to the pivotal connection betweenthe blade and the link to one end of the motor-shaft), that is rotatedand advanced during the operation of a flue-cleaner provided with myimproved cutter in any approved manner. shank of the blade is formed bya piece that is separate from the piece that forms the blade. Thepeculiar illustrated link connection between the cutter and themotor-shaft forms a universal joint that accommodates the movement ofthe cutter through a curved fine.

The blade of my im proved cutter is preferably flat upon opposite sidesand provided with two diametrically opposite cutting edges 0' and aformed upon opposite side edges, respectively, of the blade, and thesaid edges are suitably beveled or sharpened,as required, to form thedesired cutting edges. The two cutting edges between the rear end of theblade and the central portion of the blade are preferably parallel orapproximately so; but from the central portion of the blade to theblades forward extremity the said cutting edges converge almost to apoint at the blades forward extremity. One of the cutting edges and edgea of the blade illustrated has its forward and inwardly-inclined portionseal loped, as at a to render it capable of cutting grooves or channelsin the scale or deposit formed internally of the tube that requirescleaning, so as to facilitate the said cutting edge in operating uponthe scale or deposit, and the said scalloped cutting edge may beconsidered the forward cutting edge of the cutter. The other cuttingedge a of the cutter is preferably plain from end to end of the bladeand may be considered. the rear cutting edge of the cutter, and isadapted to effectually remove the scale or deposit not removed or onlypartially removed by the scalloped cutting edge. The scalloped cuttingedge has the rounded depressions a, that are formed between the scallopsa arranged, therefore, inside of the annular path traversed by the plaincutting edge a during the operation of the cutter.

My improved cutter has given very satisfactory results in practice. Thecutter does the work for which it is designed effectively and the twocutting edges Wear uniformly thatis, both cutting edges participateequally in the work upon the scale or deposit that requires to beremoved.

In the case illustrated the A scalloped cutting edge having alternatlsubjected.

ing rounded scallops or projections a and depressions a is preferable toan ordinary toothed or serrated edge, because it is more durable,especially for the Work for which a flue-cleaner is designed, and myimproved construction of cutter comprises a scalloped cutting edgehaving the alternating rounded swells and depressions formed upon theforward and inwardly-extending portion of the cutting edge. I wouldremark also that the cutting edge bearing portions of the cutter arepreferably somewhat curved laterally in opposite directions,respectively, as shown in Fig. III.

It will be observed that the depressions a of the scalloped cutting edgeare arranged between the sweep of the plain cutting edge (L2 and theaxial line of the cutter, so that the scales or incrustation notoperated upon by the scalloped cutting edge, because of the depressionsin the said edge, are removed by the plain cutting edgethat is, thescalloped cutting edge leaves ridges of scale,which are removed by theplain cutting edge. The work of removing scales from flues is too severefor a tool whose cutting edges are all plain. It

is also too severe for a tool that has both of its cutting edgesscalloped or that is otherwise rendered frail and not suificientlystrong to withstand the strain to which the tool is It is also importantthat the proj ections a and the depressions a of the scalloped cuttingedge are rounded, because angular projections and angular depressionswould render the said cutting edge frail and not sufficiently durable towithstand the great strain under which a tool of the character indicatedmust necessarily operate. By distributing the work, however, between thescalloped edge and a plain edge and having the projections anddepressions of the sealloped cutting edge rounded a tool su fficientlydurable and capable of operating with great facility is produced.

What I claim is A flue-cleaning blade comprising a body portion providedwith two straight cutting edges arranged parallel to each other and astraight point having a straight cutting edge on one side and having aseries of grooves and ridges formed in its other side, said grooveshaving curved bottoms and the intervening ridges having curvedcutting-surfaces, substantially as described and for the purpose setforth.

Signed by me at Cleveland, Ohio, this 9th day of September, 1899.

CHARLES I3. EASTY.

Witnesses:

C. H. DORER, A. T. PARRATT.

